The actual level of intensity depends on such factors as the physical layout, population density, and productive activities of a metropolis.

实际的强度水平取决于诸如大城市的物理布局、人口密度和生产活动之类的因素。

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It gives us time for more productive activities.

这些时间可以花在更有生产率的活动中。

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Thinking is one of the most productive activities a human being can undertake.

思考是人所能从事的最有成果的活动之一。

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Instead, they do various things like govern and are priests, and are bureaucrats, and are engaged in other non-productive activities that depend upon others to feed them.

相反,他们从事其他职业,例如行政人员,神职人员,或是成为官僚,参与其他,非生产性活动,依赖他人供养

耶鲁公开课 - 古希腊历史简介课程节选

With the reward reduced, the incentive for pursuing these economically productive activities is reduced.

FORBES: The Anachronism Of State Income Taxes

The government spending that creates the demand for tax revenue soon draws resources away from more productive activities.

FORBES: Is There Such A Thing As Tax-Free?

These reformed programs would also involve incentives for productive activities that would contribute directly to economic growth and prosperity today.

FORBES: Economic Growth, Not Redistribution, Most Benefits The Poor, Working People, And The Middle Class